5.   Advanced Rudder and Propeller System: A well designed Propeller and streamlined rudder system can reduce the fuel consumption up to 4 % resulting in less emission. Advanced designs of propeller and rudder systems have been developed to not only reduce the fuel consumption but also improve the speed of the vessel.

6.   Speed Nozzle: Speed Nozzles are generally used in small supply vessels and tugs to provide power to the ships. Along with new design features of merchant vessels, they can improve the propulsion efficiency of the ship by saving power up to approx 5 %.

7.   Hull Paint: Another important factor that can increase the fuel consumption of a ship and hence emissions is improving hull properties. Applying correct paint at correct hull area can reduce the frictional resistance of the ship resulting in 3-8% of fuel savings.

8.   Waste Heat Recovery System: This system is already in use for quite some time now, but making it more efficient can reduce the fuel consumption of the ship drastically up to 14% of the total consumption. The waste heat from the exhaust gases can be utilised to heat and generate steam which in turn can be used for heating cargo area, accommodation, fuel oil etc.

9.   Exhaust Gas Recirculation: In this system, NOx emissions from the engine is reduced by recirculation of exhaust gas from engine cylinder with scavenge air which lowers the temperature of the combustion chamber. Some part of the exhaust air is re-circulated and added to scavenge air of the engine which reduces the oxygen content of the scavenge air along with temperature of combustion cylinder. With this method NOx reduction of up to 80% can be achieved.

10.  Water in Fuel: The addition of water in fuel just before its injection into the combustion chamber can reduce the temperature inside the cylinder liner. An efficient system for this can result in NOx reduction of up to 30-35%.

11.   Improved Pump and Cooling Water System: An optimized cooling water system of pipes, coolers and pumps can result in decreased resistance to the flow. This will lead to savings of up to 20% of electric power of the ship and fuel consumption up to 1.5 %.

12.   Sail and Kite Propulsion System: Sail and Kite propulsion system when used along with the conventional propulsion system can reduce the fuel as well as NOx, SOx and CO2 emissions by 35%. Read more about these green propulsions system here.

13.   Fuel and Solar Cell Propulsion: The fuel cell propulsion utilizes power from a combination of fuel cells, solar cells and battery systems. This helps in reduction of GHG emission to a great extent.

14.   Sandwich Plate System (SPS): It is a process of composting two metals plates by bonding it with polyurethane elastomer core.  This avoids usage of steel which requires additional stiffening hence makes the structure light weight and less prone to corrosion. This technology can definitely play a good role in green ship recycling process as SPS feature includes superior in service performance and reduced through life maintenance.

Do you think we have missed an important Green Ship Technology? Let us know and we will add it to the list.